Typewriting machine with power drive



April 27 1926.

C. SCHLUNS TYPEWRITING MACHINE WITH POWER DRIVE Original Filed July28'. 1923 3 Sheets-Sheet 1 April 27 c. scHLUNs TYPEWRITING MACHINE WITH POWER DRIVE l ori im Filed Jul 28. -19 s ,Figa

5 Sheets-Sheet 2 April 27 1926.

c. scHLONs TYPEWRITING MACHINE WITH POWER DRIVE 5 Sheets-Sheet 3 @riginal Filed July 28, 1923 Pa-nea Apr. 27, 1926.

UNITED STATES CARL SUHLNS, OF BERLIN-STEGLITZ, GERMANY, ASSIGNOB TO .MERCEDES-BRO MASCHINEN UND WAFFEN-WERKE, 0F BENSHAUSEN, THURINGIA, POST MEHLIS,

GERMANY.

TYIPEWBITING MACHINE WITH POWER BREVE.

Original application led July 28, 1923, Serial No. 654,446. Divided and this application led June e, 1925. serial No. 34,444.

To all whom it may concem Be it known that I,- CARL ScHLNs, citizen of the German Republic, residing at Berlin-Steglitz, Germany, have invented certain new and useful -Improvements in Typewriting Machines with Power Drives, of which the following is a specification.

The present invention relates particularly to automatic return mechanism for power driven typewriters and is a division of my co-pending application Ser. N o. 654,446 filed July 28, 1923.

According to the invention, the feeding of the paper carriage and the line-feed are carried out automatically from the source of mechanical power by the arrangement of a rope or band attached to the line-feedlever and wound 'around a drum through the action of the source of power. In order to start without shocks the movement of the paper carriage and the other feeding movements at the throwing in and out of gear of the power-cou ling an elastic element, for instance a bulfiir spring, is inserted between the driving memberand the driven member, said spring absorbing theshock produced at the throwing inv gear of the coupling. The source of power may be temporarily coupled with the members to be driven by a toothedor electro-magnetic coupling. 'llhe throwing in and out of this couplin is controlled automatically from the rig t hand or left hand margin-adjuster, or by the depression of a key. Care has further been 'taken that the usual possibilities of manipulation by hand of the movement of the paper carriage and of the line-feedare preserved.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompan ing drawings forming a part of this speci cation, with the understanding that while .on the drawings one embodiment of the invention is disclosed, the invention is not confined to any strict conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

ln the drawings Fig. 1 shows in perspective front elevation a typewritng machine in which the ma-` chine proper is shownv in elevation and the power coupling in section.

F ig. 2 is a p-lan view of Fig.. 1.

Figs. 3 and 4 show details of the coupling mechanism shown in F ig. l.

The movement of the carriage is controlled by the coupling shown 1n Figs. 3 and 4 on an enlarged scale. Y

In the worm case 7l fixed on the machine a bolt 72 is fixed on which the worm wheel 7 8 is rotatably mounted being secured against axial displacement by collar 74, screw 75 and washer 7 6. On the worm wheel a carrier disk 79 having a groove 78 is fixed by two screws 77.

1n the machine frame itself a bush 81 with collar 80 is located which is threaded at the left end and adapted to be securely connected with the frame by means of a nut 82. A band pulley 83is rotatably mounted on the bush 81 and .has atl its right hand side two single teeth 84. The band pulley is hollow and accommodates a spiral spring 85 attached on the one hand to bush 81 and on the other hand to the inner circumference of the band pulley 83, so that the spring 85 wound up, viewed in the direction ofthe arrow 86, acts upon the band pulley 83 in anti-clockwise direction. The band pulley 88 is closed by a lid 87 xed thereto and the whole is secured against axial displacement by the collar 80 of bush 81, adjusting ring 88 and adjusting screw 89.

ln the bush 81- the shaft 90 is revolubly mounted and on this shaft a disk 91 is keyed and retained by a screw 92. A bolt 98 is laterally riveted on the disk and a roller 94 mounted on said bolt engages with a groove 95 of the disk 96 keyed on the kcam shaft 11. rlhe shaft ,11, as described in my original application, serves as actuator for the type levers. At the opposite end of shaft a carrier disk 99 having an aperture 98 is ixed by a bolt 97 so that the shaft 90 is secured against axial displacement. @n the carrier disk 99 a roller 101 is rotatably lined by a bolt 100, said roller engaging with the above mentioned .groove 78 of the carrier disk 79 fixed on the worm wheel. ln the annular groove 98 (Fig. 4) a block 108 is hired by means of a screw 182, said block serving as abutment for the one end of aspring 104, the other end of which ,bears against a block 106 fixed to a ring 105. This block 106 is inserted into the carrier disk '99 before the ring 105 ispushed over said disk. The ring 105 is iixed to block 106 by a screw 107 whereby the ring, which is rotatably mounted on disk 99, issecured against axial dis lacement. On the ring 105 a coupling dis 110 having teeth 108 and a groove 109 is fixed by means of keys 111-so that it is able to rotate together with the ring 105 on which it may however be displaced in axial direction. y f

The operation of the coupling is as ollows f At'the carriage 112 running down (llig. 1) the pawl 113 ot the right hand margin adjuster 114 runs up the slice 115 ot the' upper key-locking-bar 116 which is movably mounted by means of a slot 117 at the right hand end on a screw 118 fixed to the trame and which is. guided vat the lett hand end by means ot slot 119 on a stud 120 of the set-od rod 121which is constantly urged upwardly under the action of a spring not shown in the drawing. The upper keyA-locking-bar 116 is thusV pressed rst downward and at the further running down of the carriage it is pushed to the lett undertlie abutment 128v ony the stationary trame of 'the machine owing to the action exerted by the pawl 113 of the marginaduster 114 upon the abutment 122". At this proceedingthe locking known per se of all the keys'is edected by the rod 121, and lasts during the return of the carriage and during the line-feeding.

Gwin to the fact that the upper keylocking-bar is pushed to the lett a lever 125 pivotally connected theretoy by pin 124 is also drawn to the lett, said lever 125 being hingedly connected at 126 with a lever 127 which is thus also pushed to the left. lhis lever 12'?7 is keyed toa rotatable axle 128 lon which further a lever 129 is keyed which consequently also executes an oscillationto the lett and by the engagement known per se of this lever with the groove 109 of the coupling sleeve 110 driven from the motor ll/lF (Fig. 2) and rotated permanently through the intermediary of the worm wheel gear (Figs. b1, 3 and 4i) this coupling sleeve is pushed to the lett. The teeth 108 come thus in gear with the teeth 84 and the band pulley 88 is drawn along in the same direction of rotation as the coupling sleeve 110 (Fig. 3) which, seen in the direction ot the arrow 80, rotates in anti-clockwise direction. A. band 130, attached to the band pulley 83 is wound up and, guided over guide pulleys 131, 132, draws along a bar 133 movably mounted'in the well known manner in the carriage (liiig. 2). This bar 133 is pivoted at 13d to the leed-lever 135 `tor the lineeeding and it eiiects the line-feeding in the wellknown manner. After the termination ot in front of the `abutment v123v and the coupling is disengaged by means of the ,lever system 125, 127, 129. The kinetic energy communicated to the carriage by the upward movement is neutralized by the work done at the disengagingof the coupling so that the carriave arrives at the extreme right hand position without any shock. By depression of a key 138 mounted on rod 121 the upper key-locking-bar may be operated, in conjunction with tension spring 138',

whereby the coupling is also thrown in so that the saine operation begins anew. This releasing may be edected at any position of the paper carriage.

At the instant at which the coupling sleeve 110 comes in engagement with the band pulley a shock and a vibration 'would be produced in the machine it there were no 'special measures taken. 'lhis is avoided by the` above mentioned arrangement ot the spring 104. (Fig. 4:) in the carrier disk 99 so that the running up ot the carriage is started without shock.

rlhe spring 85 in the band pulley 83 serves merely for stretching the band 130 when the carriage is running down or is being pulled up by'hand.

Claims- 1. ln a motor' driven typewriter, a constantly rotating shatt, type keys, a type key locking element, a paper carriage, means for returning said carriage, a clutch for coupling said carriage-returning means to said Constantly rotating shaft, a horizontally and vertically movable bar, connections between said bar and said ,key-locking element for actuating said key-locking element upon vertical movement of said bar, connections between said bar and said clutch tor actuating said clutch upon horizontal movement of said bar, and cooperating lugs on said carriage and' said bar for moving said bar vertically and horizontally.

2. lin a motor driven typewriter, a constantly rotating shaft, type keys,a type key locking element, a paper carriage, means for returning said carriage, a clutch for coupling said. carriage-returning means to said constantly rotating shaft, ahorizontally and vertically movable bar, connections between .said bar and said-key-locking element for actuating said key-locking element upon vertical movement or said bar, connections be weaves tween saidbar and said ciutch for actuating said, clutch upon horizontal movement of said bar, a cam and an abutment on said bar, a lug on said carriage for engaging at one limit of movement of the carriage, first said cam for moving the bar vertically to lock the keys, and then lthe abutment for moving the bar horizontally to engage the clutch, a keeper under which the end of said bar is moved upon said horizontal movement, a second lug upon said carriage for engaging said abutment, when the carriage reaches its other limit of motion, for moving said bar horizontally to throw the clutch out and release' said bar from said keeper, and spring means for returning said bar to linitial vertical position.

coupling member, said annulus having a lateral lug thereon, a fork engaging said circumferential groove whereby said annulus is adapted to be displaced toward said drum for engaging said lugs, and a cable connected to said carriage and adapted to be wound on said drum.

4. In a carriage return device for motor driven typewriters, a constantly rotating shaft, a free clutch element concentrically mounted relative thereto, and a constantly rotating clutch element. on said shaft comprising three concentric 'annular members, the innermost of said members being fixed to said shaft, yieldable means interposed between said innermost member and the intermediate member for allowing relative rotational movements of the two, the outmost of said members being splined to said intermediate member, and means for. displacing said outmost member for engaging said free clutch element.

The foregoing specification signed at Berlin this 18th day of March, 1925.

CARL SCHLNS. 

